Question

*我正在尝试打印一些东西，但背景为粉红色和白色文字。但文本颜色确实发生了变化，但屏幕总是呈黑色。 *

import java.awt.*;
import javax.swing.JFrame;

public class Screen {
private GraphicsDevice vc;

public Screen(){
    GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();

    vc = env.getDefaultScreenDevice();
}

public void setFullScreen(DisplayMode dm, JFrame window){
    window.setUndecorated(true);
    window.setResizable(false);
    vc.setFullScreenWindow(window);

    if(dm!=null && vc.isDisplayChangeSupported()){
        try{
            vc.setDisplayMode(dm);
        }
        catch(Exception ex){

        }
    }
}
public void restoreScreen(){
    Window w=vc.getFullScreenWindow();
    if(w!=null ){
        w.dispose();
    }
    vc.setFullScreenWindow(null);
}


}

现在的主要方法：

import javax.swing.JFrame;
import java.awt.*;
public class myGuiMain extends JFrame {
public static void main(String arg[]){


    // Screen.java

    DisplayMode dm = new DisplayMode(800,600,16,DisplayMode.REFRESH_RATE_UNKNOWN);
    myGuiMain m = new myGuiMain();
    m.run(dm);
}

public void run(DisplayMode dm){

    setForeground(Color.WHITE);
    setBackground(Color.PINK);
    setFont(new Font("Arial",Font.PLAIN,25));

    Screen s = new Screen();

    try{
        s.setFullScreen(dm, this);
            try{
                Thread.sleep(5000);
            }
            catch(Exception ex){

            }
        }finally{
            s.restoreScreen();
    }

}

public void paint(Graphics g){
    g.drawString("This is gonna be awesome",200,200);

}
}

结果：

enter image description here

我一直在互联网上搜索但最终没有任何结果。如果有人可以解决此问题，请提前致谢。

Answer 1

问题＃1：从JFrame延伸。通常这是不鼓励的，因为它将你锁定到一个用例（你不能真正将框架添加到其他任何东西），此外，你并没有真正向该类添加任何新功能。最好只在需要时创建一个实例

问题＃2：覆盖顶级容器paint（JFrame）。出于多种原因，通常不鼓励这样做：打破油漆链（你已经完成）很容易;它不是双缓冲的（对闪烁的更新问好）;可以绘制子组件，而不需要重新绘制父容器（你好奇怪的油漆更新和artificates）。

最好创建一个自定义类，从JPanel扩展并覆盖它的paintComponent方法并在那里执行自定义绘制（并在进行任何自定义绘制之前调用super.paintComponent）< / p>

有关详细信息，请参阅Painting in AWT and Swing和Performing Custom Painting

像...一样的东西。

Painting

import java.awt.Color;
import java.awt.Dimension;
import java.awt.DisplayMode;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Window;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class myGuiMain {

    public static void main(String arg[]) {
        new myGuiMain();
    }

    public myGuiMain() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);

                DisplayMode dm = new DisplayMode(800, 600, 16, DisplayMode.REFRESH_RATE_UNKNOWN);
                try {
                    Screen.setFullScreen(dm, frame);
                    try {
                        Thread.sleep(5000);
                    } catch (Exception ex) {

                    }
                } finally {
                    Screen.restoreScreen();
                }
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            setForeground(Color.WHITE);
            setBackground(Color.PINK);
            setFont(new Font("Arial", Font.PLAIN, 25));
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(600, 400);
        }

        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            g2d.setColor(getForeground());
            g2d.drawString("This is gonna be awesome", 200, 200);
            g2d.dispose();
        }

    }

    public static class Screen {

        public static void setFullScreen(DisplayMode dm, JFrame window) {
            GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
            GraphicsDevice vc = env.getDefaultScreenDevice();
            window.setUndecorated(true);
            window.setResizable(false);
            vc.setFullScreenWindow(window);

            if (dm != null && vc.isDisplayChangeSupported()) {
                try {
                    vc.setDisplayMode(dm);
                } catch (Exception ex) {

                }
            }
        }

        public static void restoreScreen() {
            GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
            GraphicsDevice vc = env.getDefaultScreenDevice();
            Window w = vc.getFullScreenWindow();
            if (w != null) {
                w.dispose();
            }
            vc.setFullScreenWindow(null);
        }

    }
}

您可能还想查看2D Graphics

背景颜色Java Graphics 2D中的颜色始终为黑色

1 个答案: